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Old 13th January 2012, 07:03 PM   #261
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Join Date: Aug 2011
Location: Germany
Slowly I continue building the speaker enclosure. I had to do little modifications but nothing important.
I attached a picture for you to see . I think it'll be closed on sunday evening.

Best regards
Sven
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File Type: jpg IMG_0167.jpg (676.5 KB, 1114 views)
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Old 15th January 2012, 02:58 PM   #262
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Join Date: Aug 2011
Location: Germany
Just in time .

It is finished though it is not painted and veneered yet. It is playing with my needles now and doesn't sound that bad. The port is pointed upwards because of the cable. In the living room it will be directed to the bottom. I attached a picture of the center and a quick frequency response. Because I have no calibrated microphone I will have to measure again compared to the needle. So I can have a result that is relative to a known loudspeaker .
I will post a drawing in the next days if someone wants to build this one too. It was very easy and the result is okay.
I should mention that my center doesn't have any correction circuit by now. This will be added as soon as I have the time to make some measurements at a friend of mine.

Best regards
Sven
Attached Images
File Type: jpg IMG_1699.JPG (965.3 KB, 1018 views)
File Type: jpg TABAQ_F-Gang.jpg (177.4 KB, 949 views)
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Old 22nd January 2012, 10:23 AM   #263
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Hello again,

I did some more measures with holmimpulse. I did try a correction circuit with 3.5 Ohm and 1.2 mH but I didn't get a result that's pleasing me. So I still have some work to do .
Any way, I attached the frequency response of the TABAQ-Center with and without the correction circuit against the Needle RS. The microphone was on axis in 1m distance. I added a small piece of wood behind the center to get some reflection out of the port.
It isn't so bad compared to the Needle but I think it could be a little better . In the vocal frequency range (I think that is most important for a center) it is nearly on point with the needle.

@Bjørn: I'm interested in your progress with your TABAQ-center. Is there anything new?


Greets
Sven

P.S.: I didn't forget the drawings but at the moment I have little time as I have to do a documentation for another loudspeaker first (D'Appollito with two TMT and a full range driver)
Attached Images
File Type: jpg IMG_0178.jpg (545.8 KB, 884 views)
File Type: jpg IMG_0179.jpg (512.7 KB, 843 views)
File Type: jpg TABAQ_vs_Needle.jpg (167.1 KB, 237 views)

Last edited by bAD kLOPFER; 22nd January 2012 at 10:27 AM.
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Old 29th January 2012, 01:05 PM   #264
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Join Date: Aug 2011
Location: Germany
A short update:

The drawing . Don't be confused as the naming of the parts is in german. There are no dimensions for the pocket for the TB as this is an individual choice of the speaker. And as far as the 1320SJ is concerned you definitely need a template for the milling.

TABAQ-Center Drawing

Best regards
Sven

P.S.: I currently have problems with the attachments. As soon as I'm able to I'll add the drawing as an attachment.
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Old 7th February 2012, 04:44 PM   #265
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Join Date: Feb 2011
Well, I have another substantial question.
The design is ~85 cm tall, so even with the driver mounted higher than recommended it isn't very practical. A 55Hz wave is around 1,5 meter long but we can reduce it thanks to stuffing and mass loading by a narrower port, right?
The w4-1320 resonances probably aren't as hard as with the smaller driver due to lower Qts, so maybe I could resign from mass loading and just build a higher tower? How high could it be then?
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Old 21st February 2012, 05:43 PM   #266
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Join Date: Aug 2011
Location: Germany
I got an idea for a center-design that fits to my TQWTs. I attached it.

Have fun
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File Type: jpg TABAQ_rendered_2.jpg (599.4 KB, 227 views)
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Old 4th March 2012, 05:56 PM   #267
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Join Date: Aug 2011
Location: Germany
My center project is nearly finished. I moved the center from my workshop to the living room to do some measuring. I modified my micro-stand because of an 18 kHz peak but it is still there. So I am still searching the reason for this.
I attached the measures (red = original, blue = 1,1 mH parallel to 3,3 Ohm circuit, above them a near field measure <1 cm) and the pictures of the center in my living room. I need to measure a little more to "tune" the circuit right but this will come with time. I removed on piece of sonofil and it is much better in lower frequencies than before.
Im quite happy with the result. I listened to it in mono and it is quite good with different music styles. From Siris Slave Band to Nils Lofgren, from Yello to Metallica, from Mussorgsky to Oscar Peterson Trio - all are handled very good. There is enough bass for such a small loudspeaker - I think it is capable of more than being a center speaker.
If you're searching for a small center speaker then this one should be on your list .

Greets
Sven
Attached Images
File Type: jpg IMG_1730.jpg (369.6 KB, 169 views)
File Type: jpg IMG_1731.JPG (970.6 KB, 224 views)
File Type: jpg tabaqcenterfrequenzgang_158388.jpg (207.1 KB, 218 views)

Last edited by bAD kLOPFER; 4th March 2012 at 05:59 PM.
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Old 6th March 2012, 07:10 AM   #268
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Join Date: Jan 2005
Location: Copenhagen
Hi Sven, nice work !
I have finished my folded TABAQ BOX, and it is doing very well down to 45 Hz. It is really amazing what you can get out of this small driver.
TABQ BOX can be placed in any direction as long as the opening is not blocked.
The cabinet is made by 12 mm MDF, except the sides which is 9 mm plywood and 3 mm black acryl. Looks very nice according to my wife.

Click the image to open in full size.

Click the image to open in full size.
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Old 6th March 2012, 07:16 AM   #269
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Great work...wow

I still haven't tried to work with acryl as I'm afraid of scratches. But maybe the next project will have small elements made of acryl .
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Old 6th March 2012, 07:29 AM   #270
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Love the acryllic. Often wondered about using that. Well, getting someone else to, as I can't build cabinets. Not well, anyway. No facilities. Or time. Or talent...
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